Originally Posted by nleksan
Basically, if you want to overclock a Xeon, you will need to go with the older Socket 1366 (X58) platform. Everything since has been hard locked and there is ssimply no way to overclock them, due to the move away from the FSB towards all on-die and consequently the elimination of true FSB/BCLK overclocking.
If you are lucky or you look hard, you could get an EVGA SR-2 dual-processor motherboard for pretty cheap, and grab a pair of mid-range 6-8core Xeons off the bay for $200-500 (total), and have a wicked beast of a multithreaded machine that is able to overclock.
However, if you want something easier and newer, I would just go for a 3770K, a good solid motherboard, and some great RAM. It will overclock without issue, and the IPC is quite a bit better than the older 1366 platform processors (1366 is the predecessor to the current X79 LGA2011 platform, while 1156 is the predecessor to the 1155/1150 sockets). I would personally recommend the Gigabyte GA-Z77X-UP7 for the motherboard, as it's simply far and away the best 1155 board I've used, and even though I usually buy Asus, for my 3770K rig, I went with the UP7 over the Maximus V Extreme after trying both and finding that the UP7 simply trumps the M5E in every possible way. The M5E/M5F are, of course, excellent boards, as is the Gigabyte Sniper board, the Asus Z77 WS board, the Gigabyte UD5H + UP5, and if you want to be able to run 14 drives off your motherboard without having to buy an expensive hardware RAID card and lose PCI-E slots, the ASRock Extreme11 is quite fascinating with an on board LSI RAID SoC providing 8x SATA3/SAS2 ports, and two PLX chips providing 4-way SLI/CFX with at least an x8 slot per card.
When it comes to memory for the Z77 platform, my go-to is always the GSkill Trident X 2400 9-11-11-31 2x4GB kit, but I also recommend the Ripjaws Z 2133 9-11-10-28, the Ripjaws X 2133 9-10-9-28 kit (if you want to do some heavy memory clocking and benching, as it uses ICs that can hold very tight timings at high frequency given the right voltage), the Ripjaws Z 2400 9-11-10-28 (or 2400 9-12-11), or the Trident X 2600/2666 10-12-12 kits. The bang for the buck factor is very high with all of these kits, and they all provide exceptional performance out of the box, yet give a significant amount of headroom for overclocking...